OTG Plugin or Mod

[Please specify if it's about Forge Mod or Spigot server Plugin placing "x" into []]

• [ X] OTG Mod for Forge
• OTG Plugin for Spigot

OTG Version

[Please specify the full OTG version that you are running by placing "x" into []]

• [ X] 1.12.2_v8_r1
• 1.12.2_v7_DEV_r26
• 1.12.2-v6
• 1.12.2-v5
• 1.11.2-v8
• 1.11.2-v9
• 1.10.2-v21
• Other - specify here

Forge or Spigot Versions

Forge 14.23.5.2854.

What other plugins are you running?

Crash report has what you need.

Description

Create a world and join it.

[What did you expect to happen? - Explain what you expected to happen after performing the previously described steps]
My game not crashing.

[Can you provide a Minimal, Reproducible Example? See here for details: https://stackoverflow.com/help/minimal-reproducible-example]
Read what's above.
crash-2020-07-05_14.28.52-server.txt
I'm only seeing stuff related to OTG in this, so I'm not sure if this is being caused by other mods.

This error means OTG failed to load a biome from one of the biome groups. Have you been editing presets? If not, deleting the preset and letting it re-extract from the worldpacker should fix it

I'll try removing the OTG folder.
I have never touched anything related to OTG's biomes.

I'm guessing you're using a preconfigured modpack?

A pack of my own. Regenerating the folder somehow fixed it. Not sure if something currupted or not... Might've did.